In search for a cell surface receptor on profibrotic lung macrophages for use in targeted delivery of anti‐fibrotic drugs, we noted that folate receptor β (FRβ) is highly expressed on macrophages from both human IPF lungs (Hu et al, 2019) and murine bleomycin (BLM)‐induced fibrotic lungs (Nagai et al, 2010), but largely absent from cells in normal healthy tissues (Low et al, 2007) (see also Fig EV1). The gene discussed is CD177; the disease is idiopathic pulmonary fibrosis.